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In Reply to: RE: Anyone have the Stellar Labs DT-1200 HD Television Tuner / Recorder with HDMI out? posted by blue_z on July 23, 2013 at 03:51:22
The power supply in my new DT-1200 burned out shortly after I bought it for $79.95. I traced the problem to a dead switching power supply. As a temporary fix, I wired a regulated +12 VDC 1A wall wart and a regulated +5 VDC 2A wall wart to the circuit board and mounted them external to the case on a power strip, so they turn on and off together. I had these wall warts in my junk box, so this fix didn't cost me anything. This rigged up power supply has worked so well for the past year that I've never bothered to order the proper power supply for the recorder. If you ever try this, Be sure to use REGULATED DC wall warts, or you could burn out the main circuit board. The DT-1200 works perfectly now that it has stable power and the recordings of HD broadcast are indistinguishable from the original broadcast. Incidentally, it records on a removable thumb drive that's not included with the recorder.
Follow Ups:
What Connections did you use to wire up the 12V PSU... I have the sane problem with the DT-1200. There's 5 wires..?
Best Regards,
Lou
The reason why there are five wires from the power supply to the main circuit board is because the main board requires three power inputs, which are +5 VDC, +12 VDC and -12 VDC. That would require six wires, but the +12 VDC and -12 VDC share a common ground, resulting in five wires. You need to make sure you only use regulated DC power supplies, because many wall wart supplies that say 12 VDC are unregulated. The output voltage of an unregulated wall wart depends on the load, so the voltage of an unregulated supply could rise to 15 volts or more and damage the main board, so be sure you use regulated wall warts. Also, be sure your 5 volt supply sources at least two Amps, and your 12 volt supply sources at least one Amp. Finally, use a power strip or connect the wall wart plugs together, because turning the wall warts on individually could damage the main circuit board. If you use individual wall warts, then you can use a simple wiring trick to eliminate the negative power supply, as explained later. Now, here is how I connected the wires: I don't know how to put a diagram on here, so I'll have to explain it in words. First, cut the ribbon cable going from the internal power supply to the main circuit board. Then, split out the individual conductors on the section of the cable going to the main board and strip the wire ends. This cable has five individual conductors that are identified by the following symbols. 1) blank, 2) long dashes, 3) X, 4) short dashes and 5) dots. Next, label and strip the wires going to the +5 and +12 volt wall warts and use wire nuts to connect the power supplies to the indivicual conductors of the cable going to the main board as follows: 1) +12V, 2) 12 volt ground, 3) 5 volt ground 4) +5 V and 5) +5 V. This wiring has been tested and it eliminates the need for a separate -12 V power supply, but don't ask me why, because I figured it out a long time ago and I've forgotten the reason why this works. Looking at it today, it seems like I should be using the 12 volt supply twice and not the 5 volt supply. But, these connections have worked for a year, so wire it up this way unless you want to experiment with a different connection scheme, or use a second 12 volt wall wart for the negative rail. .
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